The Tiffany & Co. 440M1198 mark appears on sterling silver pieces made by Tiffany & Co., a leader in American luxury silver design. The number 440M1198 represents an internal cataloging system, where 440 and M1198 likely refer to a specific pattern and production sequence. The presence of the letter M often associates the piece with the John C. Moore II period of Tiffany production, reflecting a high standard of craftsmanship and meticulous attention to design. This mark ensures authenticity and aids collectors in precisely identifying and dating Tiffany silver items.